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前言铰结板桥在使用中,沿铰缝产生纵向裂缝的现象时有发生,解决这个问题,除了施工时加强铰式键混凝土浇捣的密实性外,设计时正确地进行强度验算至关重要,其关键问题是弄清楚铰缝中切力的分布规律及峰值的大小。《钢筋混凝土桥》一书中采用的计算方法,假定铰缝中切力沿跨长为正弦半波曲线的分布规律,这与较严格的分析结果是不相符合的。众所周知,只有当外荷载沿跨长是正弦半波形式作用时,铰结板桥中各梁的挠度、内力、乃至铰缝中的切力才都是沿跨长作正弦半波的分布形式。当实际上作用一集中力时,(小跨径板桥经常遇到这
Foreword In the use of hinge plate bridge, along the longitudinal cracks along the joints occurred from time to time to solve this problem, in addition to strengthening the construction of the hinge-key concrete pouring compaction, the design of the correct strength checking is crucial , The key issue is to find out the distribution of shear force in the joint and the size of the peak. The calculation method used in the book “Reinforced-Concrete Bridges” assumes that the distribution of shear force along the span of a hinge joint is a sine-half-wave curve, which is inconsistent with the more rigorous analysis results. It is a well-known fact that the deflection, internal forces, and even the shear forces in the hinge joints of beams in a hinge bridge are all sinusoidal half-waves distributed along the span only when the external load is acting as a half sine wave along the span. When actually acting on a concentration, (small span Itabashi often encounter this